Finding the Fourth Proportional to 89,406.50, 123,387.89 and 51,178.05

Step by Step Solution

1. Step 1: Write the proportion equation
   89,406.50 : 123,387.89 = 51,178.05 : x
2. Step 2: Convert to fraction form
   89,406.50/123,387.89 = 51,178.05/x
3. Step 3: Cross multiply
   89,406.50x = 123,387.89 × 51,178.05
4. Step 4: Simplify right side
   89,406.50x = 6,314,751,347.92
5. Step 5: Solve for x
   x = 6,314,751,347.92/89,406.50
6. Step 6: Final answer
   x = 70,629.67